Steam-generating apparatus.



D. HOGAN.

STEAM GENERATING APPARATUS.

APPLICATION FILED MAR. 19, 1912.

1,103,205. Patented Jul 14,1914.

DANIEL HOGAN, or sr. LOUIS, MISSOURI.

STEAM-GENERATING APPARATUS.

Specification of Letters Patent.

Patented July 14, 1914.

Application filed March 19, 1912. Serial No. 684,686.

To all whom it may concern Be it known that I, DANIEL HOGAN, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Steam-Generating Apparatuses, of which the following i a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to steam generators of the type in which gas is used as the heat ing medium to generate steam that is used for heating purposes.

The main object of my invention is to provide a steam-generating apparatus of the type referred to which is so constructed that all of the heat units in the gas are utilized.

Another object is to provide a steam-generating apparatus which is so designed that the spent gases or gases that have come in contact with the heating surfaces of the boiler mingle with the steam that is generated in the boiler and thus raise the temperature of the steam.

Another object is to provide a boiler that has a relatively great heating surface and in which the combustion chamber is con nected with the steam dome by means of one or more flue through which the spent products of combustion travel, thereby causing all of the heat units in the heating medium to be utilized.

Another object is to provide a boiler having water-tubes arranged in the combustion chamber and fire-tubes that establish communication between the combustion chamber and the steam dome. And still another object is to provide a gasheated steam-gem erating apparatus which is so designed that it is not necessary to use a waste flue or chimney for carrying off the spent gases.

Other objects and desirable features of my invention will be hereinafterpointed out.

Figure 1 is a vertical sectional view of one type of boiler embodying my invention; and Fig. 2 is a vertical sectional view of one of the burners of the apparatus shown in Fig. 1.

Referring to the drawings which illustrate the preferred form of my invention, A designates the combustion chamber of the boiler, B designates the steam dome, and C designates a plurality of fire-tubes that establish communication between the steam dome and the combustion chamber; The

tions, steam dome boiler is heated by one or more gas burners D of the Bunsen type that supply continuous flames to the combustion chamber A, each of said burners comprising an openended sleeve, as shown in Fig. 2, through which suflicient air to support combustion is introduced into the combustion chamber A. The boiler herein shown is an upright boiler, and has a water space that surrounds the combustion chamber and extends over the top of same, said water space communicating with the steam dome B. In order to increase the heating surface of the boiler I have arranged a plurality of rows of watertubes in the combustion chamber, as shown in Fig. 1, said water-tubes communieating with the annular shell of the boiler that surrounds the combustion chamber, and

being connected to said shell in any suitable manner. I prefer to form the boiler in secthe upper part that comprises the B, the fire-tubes C, and the portion of the water space that extends over the top of the combustion chamber, constithe lower portion tuting one section, and which comprises the annular shell and the water-tubes E, constituting the other section, said sections being connected together by mean of slip nipples 1, or in any other suitable manner. A supply pipe 2 leads from the steam dome B, and is connected by suitable branches with the radiators of the system, and means consisting preferably of a vacuum pump of any suitable type, airlines, and automatic air-valves, are connected with the radiators, so as to exhaust the air therefrom and thus keep the pressure in the circulating system below atmospheric pressure.

In a steam-generating apparatus of the kind above-described all of the heat units in the gas are utilized because the spent gases pass from the combustion chamber A through the fire-tubes G into the steam dome B and mingle with the steam therein, thus raising the temperature of the steam. Consequently, such an apparatus is more efficient and less expensive to operate than the gasheated steam generators heretofore in use which were so designed that the spent gases were conducted out of the combustion chamber through an outlet flue or waste flue. By maintaining the pressure in the circulating system at less than atmospheric pressure I insure a flow of the spent gases out of the combustion chamber into the steaiiidome,

and by arranging the fire-tubes C in such a manner that they are surrounded by the water over the combustion chamber I utilize the heat which said tubes absorb from the passing spent gases to heat the water in the upper portion of the boiler. It is, of course, not absolutely essential that the boiler be provided with water-tubes E as herein shown, but I prefer to construct the boiler in this manner because the water-tubes E not only greatly increase the heating surface of the boiler but they are arranged directly in the path of travel of the gases and consequently always remain at a high temperature. The water-tubes E can be formed from any suitable material but I prefer to form them from sheet metal, such, for example, as

i brass or copper, on account of the fact that tubes of this character absorb and transmit a greater degree. of heat than thick iron tubes.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent is:

1 A steam generator consisting of a boiler having a water space surrounding the combustion chambenya steamdome a plurality ofvertically disposed fire flues leading from the combustion chamber to the steam dome and partly surrounded by the water in the boiler, means for creating a flame in the combustion chamber, and water tubes extending transversely of the combustion chamber in the path of the flame and communicating with the water space that surrounds the combustion chamber so that the 'water of the boiler can circulate through said tubes;

2. A steam generator consisting of a boiler having a water space surrounding the combustion chamber, a steam dome, a plurality of vertically disposed fire flues leading from the combustion chamber to the steam dome and partly surrounded by the water in the boiler, means for creating a flame in the combustion chamber, and water tubes extend ing transversely of the combustion chamber in the path of the fiame and communicating with the water space that surrounds the combust-ion chamber so that the water of the boiler can circulate through said tubes, said water tubes being inclined slightly from a horizontal plane.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses, this fifteenth day of March 1912.

DANIEL HOGAN Copies ofthis patent may boobtained torfive cents each, by addressing: the Commissioner 0: Patents.

. i i Washington, D. O. 

